Each package download page contains one or more links to the licenses covering the package.
The licenses cover both source and binary packages.
By downloading any package you agree to the terms of the license(s) covering the package.

Licenses files are also distributed with each package.
The full text licenses for source packages are placed in the file
$PACKAGEROOT/lib/package/LICENSES/prefix
and the full text licenses for binary packages are placed in the file
$INSTALLROOT/lib/package/LICENSES/prefix,
where
prefix
is the longest matching prefix of the package name.
The
package license
command lists license text files.

Each package also has a license property file
$PACKAGEROOT/lib/package/package.lic
that is used to generate the copyright notice headers that are
prepended to the top of source files as they are copied to the source tarballs.
The
package copyright
command lists the source copyright notices.

Package components may have specific licenses in the the component source
directory.
These are typically named
LICENSE
or
COPYRIGHT
and are under the control of the component owner.

Any archives, distributions or packages made from source or
binaries covered by license(s) must contain the corresponding
license file(s).

Links to licenses covering AT&T Research software distributions follow.
Unless otherwise noted,
packages released after 2012-01-01 are covered by the EPL (Eclipse Public License 1.0),
packages released between 2005-01-01 and 2012-01-01 are covered by the CPL (Common Public License 1.0).
Pre-2005-01-01 releases are covered by a hodgepodge of licenses
gratefully obsoleted by the EPL.
Nonetheless, if you select a pre-2012-01-01 package you are bound by
the terms of the specific license.
Note that some pre-2005-01-01 packages have reached their final release.